Physics Questions

1.

1 point

If the current leaving battery in a series ciruit is 6 A, there should be a current of ___?_____ returning to the series ciruit.

3 A

0 A

6 A

2.

1 point

Resistance goes up if:

there is less surface area.

the wires in the circuit are cooled.

the material used in the circuit is an excellent conductor.

the length of the wires in the circuit are reduced.

3.

1 point

What charge do electrons have?

neutral

positive

negative

4.

1 point

What one light is turned of in series, the other light:

goes out.

stays lit with the same brightness.

gets brighter.

5.

1 point

What is the voltage in a circuit with a power of 4 W and a current of 8 A?

4 V

32 V

0 V

0.5 V

6.

1 point

Copper holds electrons poorly, and is an example of a(n):

insulator.

conductor.

7.

1 point

The white wire in a house carries:

O V

+120 V

-120 V.

8.

1 point

A lightning rod is taller than your house and attached to the:

ground.

roof.

house.

9.

1 point

Circuits with more than one path for the electrons to travel are called:

parallel.

series.

10.

1 point

When a thundercloud is near the Earth, the charge of objects on the Earth becomes positive. This is called charging by:

contact.

friction.

induction.

11.

1 point

I is the symbol for:

potential difference and is measured in volts.

resistance and is measured in ohms.

current and is measured in amperes.

12.

1 point

Electricity that is not moving is called:

static.

circuit.

current.

13.

1 point

The activity series is as follows:
Acetate (weak hold on electrons)
Paraffin Wax
Ebonite (strong hold on electrons)
What charge will acetate have if rubbed with ebonite?

positive

neutral

negative

14.

1 point

The formula for resistance is R =

V * I

I / V

V / I

15.

1 point

Which of the following is a renewable energy resource?

solar

natural gas

fossil fuel

16.

1 point

An atom that has lost two electons is a:

-2 ion.

0 ion.

+2 ion.

17.

1 point

What is the current in a ciruit with a resistance of 6 ohms and a potential difference of 18 V?

0 A

108 A

6 A

3 A

18.

1 point

If a load has an input energy of 42 J and an output energy of 12 J, what is the efficiency of the load?

30%

28%

72%

54%

19.

1 point

What type of energy is wasted by a light bulb?

gravitational

thermal

radiant

20.

1 point

If there is battery with a potential difference of 10 V split down two identical pathways each with identical loads, each load would have a potential difference of:

5 V

10 V

2 V.